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The problem is that everyone has a different "taste" when it comes to these settings. I like to turn the color all the way down to start with. You should (if the set is factory adjusted correctly) have a black and white picture. If it's not B&W, then there's something inside the set that needs adjusted and you should get a service call. Then I adjust brightness and contrast to get the best B&W picture. Then I turn the color up until I'm happy with the color level, then I adust tint.

SET CONTRAST AT ABOUT 75 PER CENT COLOUR 50 PER CENT BRIGHTNESS 40 PERCENT LEAVE TINT ALONE.
THIS IS A ROUGH GUIDE BUT I HOPE IT HELPS.FOR BETTER RESULTS USE A DVD LIKE RATATOUILLE AND USE THE SET UP MENU.

Normally, the screen control being up a little to high, would cause this problem.
If no one has worked on this unit when it started may be a sign of something else, for example, the 200 volt line may be running a little low.
Check the brightness and contrast for starters and if that doesn't help, then, the screen control would be my next step.
Hope this helps.